Improvement in evaporating-pans for saccharine liquids



P, w.'GATEs. Evaporating Pan. No. 36,881. Patented Nov. 4,1862.

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tom, inclined sides, and vertical ends.

v ilnrrnn STATES PATENT OFFICE.

I). WV. GATES, OF CHICAGO, ILLINOIS, ASSIGNOR TO HIMSELF, THOMAS OHALMERS, AND D. E. FRASER, ALL OF SAME PLAGE.

IMPROVEMENT IN EVAPORAIING-PANS FOR SACCHARINE LIQUIDS.

To all whom, it may concern,.- j

Be it known that I, I. W. GATES, of Chicago, in the county of Cook and State of Iilinois, have invented a newand useful Improvement in Evaporating-Pans for Sugar and Sirup Juices; and I do hereby declare that the following is a full, clear, 'and exact description of the same, reference being had to the accompanying drawings, forming part of this specilication, in which- Figure l is a perspective view of an evaporating-pan adapted to the use of my improvenient. Fig. 2 is, a plan of my invention applied to the pan. Fig. 3 is a transverse section of the same.

The nature of my invention consists in aA ings.

A is an evaporator-pan, with oblong bot- This construction of vpan I prefer, as it affords broad beaches for scum and fecnlcnt matter thrown off by the juices to deposit upon; but` any other suitable form of pan may be adopted, so long as the same will enable the juice to be evaporated elfectually by steam without the aid of flame.

B B are two steam-coils, of less surface in length than the surface-length of the bottoml u as well as all 'the other bends, excepting the exhaust-bends a a, being shorter than the pan, a defecating-space, C, is formed of the forward end portion of the pan-bottom when the coils are laid on the bottom ofthe pan, as represented.

D is a common supply-pipe leading 'from a steam-generator. The vertical ends of the bends c c of the coils unite in this pipe, and thus both coils are supplied from the same source. The receiving ends of the coils, as

4well as the exhaust ends, are to be furnished with appropriate cocks to regulate the supply and exhaust of steam. l j

In practice one coil, B, might be used in a pan; but in that case one side of the pan should be vertical and the other inclined.

From the foregoing description it will be seen that very little heat comes upon the juice while it is in the d efceating-apartment C- that is, the juice is not heated to the boilingpoint. apartment a very perfect defeeation will be experienced, and the green scum :and deleterious'matter will be thrown off before it is boiled into thejuice. This matter being prevented from-ilowing into the cleansing part A of the pan by reason of a strong ebullition setting in, the operator has an opportunity to skim it off or throw it upon the beaches formed byV the inclined sides.V The further action of the coils upon the juice is to heat it intensely, so `as to produce violent ebullition at the points c c, where the steam iirst circulates through them, and thus effect an equable and complete' deposit of all remaining scum and foreign substances upon the beaches formed by the inclined sides. It' but one beach and onc coil are used, the steam will heat the juice hottest near the vertical side of the pan and compelthe scum to low toward the inclined side.

It would not alter the effect of my invention materially if the ends of the pan were carried round circularly; but as the rectangular form is the most convenient for manufacture,` I prefer that forni.

When the juice has been evaporated to the extent necessary, it is drawn off gradually ,l .u M ...a

Therefore as fast the juice enters this While :n fresh supply is flowing in. The sup The steam-coil evaporator, with the defeply is at the head of the pan and the discharge eating-apartment C, substantially in the inannt the foot. In order to maintain the flow, ner and for the purpose described.

the pan`shou1d be set slightly inclined7 so ns P. XV. GATES.

t0 have the discharge end the lowest. Witnessesz v What I elimini as niy invention7 and desire to J. L. FARGO7 secure by Letters Patent, is- NVILL A. BALL. 1 

